S9·E13 The Purge

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S9E13 (The Purge).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Do not invent/guess titles, names, dates, counts, awards, ratings, etc.
If a detail is not in the material, omit it.
Style: Original, neutral, encyclopedic prose, plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
Synopsis: Two dead victims show up with all the fat having being stolen from their bodies. Sam and Dean go undercover in order to investigate a local spa, and discover that a monster is preying on the overweight.
Sources:
Series: Supernatural (2005).
Characters: Sam Winchester (played by Jared Padalecki) and Dean Winchester (played by Jensen Ackles).
Premise: Brothers follow their father's footsteps as hunters, fighting evil supernatural beings (monsters, demons, gods).
Creator: Eric Kripke.
Network: The WB and later The CW.
Run: September 13, 2005, to November 19, 2020.
The synopsis is extremely brief: "Two dead victims show up with all the fat having being stolen from their bodies. Sam and Dean go undercover in order to investigate a local spa, and discover that a monster is preying on the overweight."
The sources provide context about the series (Sam and Dean are brothers, they are hunters, the show is created by Eric Kripke, etc.).
Problem: The synopsis is only about 40 words. The user wants a 280-380 word recap.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing." "Use only supplied facts. Never add dialogue, scene order, character names or plot events not explicitly present."
Conflict: I cannot reach 280 words without inventing details, which is strictly forbidden by the prompt. If I follow the instruction "If the synopsis is sparse, stay concise rather than guessing," I will fail the word count requirement. However, the instruction "Use only supplied facts" and "Never invent or guess... plot points" is the primary directive for an archivist.
I must prioritize accuracy and the "only supplied facts" rule.
I will include the series context provided in the sources to expand the text, but I cannot invent plot details for the specific episode.
I will describe the episode based on the synopsis and the series background.

Drafting content:
The Supernatural episode